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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a3201ef3fd406add377971708ca56967c67d65eded9ffedcc7cdd675847531' 
  AND token = 'UO3Dw5mqBwySNlAeeflT5ZNQLfMYuR/QFuNz75lFAbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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