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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c65067b740a7b26920f02113add65f2a9d969de5e4d88e4f55c33fc52bbbc9' 
  AND token = 's/eD5d/I96BNxaP8M9oJFF3mberr6lUuG+ZbDABd7dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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