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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36537585ca9188af01be15d5136d7c5170298834dd0db31d11f3a60beeb3da55' 
  AND token = 'Y9RuBW2vDZfTZSPRXtN9OgYTSepwCRNDe8w34wULCF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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