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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75435b7ae475fffaf707a69a6bc5445895c9a985e116fad452f5258a88f3b88' 
  AND token = 'xDHfd4gRIXrbRafQzh/wBfTnAw3zvdyGx9FcacxQj1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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