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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c411ba60c0484730ea54ef40284f58257a023ff67daa4a86e1d2cd951403d4c3' 
  AND token = 'BasNtg3ma+gDmVvUDEQgSh8tkBcZUN3+tAwBDW7v93Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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