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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b5785549dd04de947e4cb24a0e08205f978eb9263256d3646609ef7168f7a3' 
  AND token = 'Hvp4j02lw489OkZ3L89U/EKTY7VZe1KwfueFiNesjFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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