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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd26eaad6e301855a9aead108be2627a16c7fa9a260e79c0e6809dc639001f1' 
  AND token = 'rQSWBFmg3roR06kaAiQ8BLtyprkBl6um+QpNZehAWb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}