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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2707553e4b66ba825ca8aa96da0f4da21b39bb73f773faa64af2ca0007d7fa3c' 
  AND token = 'tJgt7x6FiYkGGUxPxrHSQA2FWYEWI0/SvRRWt2eGRpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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