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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2861b3786f4c32301ada35dda00bd861f4c7253c571b53e3088abd82a7210c1c' 
  AND token = 'iak7CwnmjC/1mzW3M0hCJQFQztmZhAofJ1QKQN7b7m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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