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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f42808d61dd1ad02ac0e2ff3679ac8971d7b79b3fee481bee0aae182f34becb' 
  AND token = '3jujUjDDsP+HX5niG88mE+0VHHHGG9O3aW42B1DigfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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