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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb08b555b752b290ac0a2fe493888f1d32b4f4ec1d039a750b362dcb5d361cce' 
  AND token = 'yT3Hi6zv3EG8M2FNXQanxL7rl9EI17FGrk/zJ6bOKYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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