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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7183eefa33cc858d15be8942db5c6d17982d35f7938d115c018eb87287c44a64' 
  AND token = 'yh70W2uRWJPJNDG6TONg0sDaCN42sDM2E6w90eAyIpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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