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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd58f0e31aae77c67c100471a95ee8c9908ff6abfbac35c18b83570d0c12095' 
  AND token = 'L+4frb4vVHRx8YhjVlvbRXUvnr7Gqk0WKYIMIAFfJVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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