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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f66d74d66797da8895d09bcaf16ed4f80f17cb79273319bf21fd7d198b3217b' 
  AND token = '7a2Uaj5ultWZ4GK2NNAYj8y+vsw8z294X9R1LSSXfA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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