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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd66d432e03b61e1bc5f365a77cc21a0ae4d0c66a9a078821ab3068c1b373dfd' 
  AND token = 'hnoIHWzUx0M8tpiUml5ooh6QnvH0nyWRNj+PRxCufDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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