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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb479961c5931842491eefac2b5df815cdd9123758ae39b5259bfa2eb3028e46' 
  AND token = 'b6xEhKx4W9veB/IkQd5ANpL2xY8r15tViBjt0eJLQ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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