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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5d5eeafd530720f24088612848906818f8d5979b34e29abfc902dda874dd05' 
  AND token = 'MK8XvXO8e8L6S3ganrTgemyvaYCi82exCiljsWEA4UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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