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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773eb9e854c720c5465ca4afdab7fc4fcd5b5d7163dd875a8de4948697479a91' 
  AND token = 'BoT7bN86+NgANbMxe7WWX4q8j5KZy+Ykz2mEZj9haEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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