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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb6795cfb43cd19b94c499bda15b84c3de9322236d801a330643847eb21fc85' 
  AND token = 'Ei2EShseegO5JkG15+MYNU+p8z6fqstOfWdOp8pmM90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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