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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e633b883f78d58bafd6842d81efc97b0cd83f39265fd018d9aee4177adc75f' 
  AND token = '+MTcUdkXrMVHztb+LlsLZ+i7Vsfh4HJMczUKKbedW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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