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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f5423f4b1235567219549dad6dac6a3249ac63a8ce41d5dd82b31bdc4d635d' 
  AND token = 'G8GkK5anE0OsaXbzCgMi6bdystQJ0dOvrrE4FWMs6QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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