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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed1d6dfd525dceacf05492bf46001713c85c822d60927db635db2c04a6ebb8c' 
  AND token = 'u2G8IdwW/LKKrR8qrXryN/hlraRwkfkx1H7iE/ElhOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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