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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bcd632a8882bf322635efdddc0c8eb6fba544c3da5e194aba3ee2bd51f0af9' 
  AND token = 'QU00oi4r1oPPsuV7M9u86vXhD3bMOxScFvv4j0GEDc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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