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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae06f93140a54e14c73d0351156c4052b1ff8b62c424e54077895edfd115822e' 
  AND token = 'TH5Crzyn2nSM7eGuU12gnSmkP6fxX3wwpiJ5gm5seBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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