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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59f9c76b3e8ea3b3b9da60ba91ae4d8cfd8e9975695086eaecafdb9d41c30db' 
  AND token = 'vgqZIVgwNQ0efc1XORjKYV6YQ8kbOwGLeGShyXPyB2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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