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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c754f4a93efc718a2ba9003decf88c876b7d51e021c933e556209a4d711c5e' 
  AND token = 'OxP5uwArwcSadnWkxjsL6nnqZKTqNfig6inUAxL8CL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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