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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29344d9a18737fbb15c3f1ce905be44e35c5e76970f435a6408dc4257314a1b4' 
  AND token = 'M16MLj29ZA8CEan28CHMwdWDl5kQaBAu6ueeN3DJwhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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