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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24a3bdc61e6ac876ec4aa17bb0afb6f0e474e3ab3e37053bdb81917088f19ba' 
  AND token = '/4KQTstPYDQhD9s/MUW5t4o2bv2pSfCxDoNHAzeNoP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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