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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa9abb93475e2143013f6a66514cc998456202d7484264bd8cb8e7748c6ab4e' 
  AND token = 'Q4DOKljrg/1WrXpKgT986Kxs2NZIhN8Dcyj38ORnblw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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