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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58854548782fe27a3bd18edb78218ae3a4b2eca952ad4a3efcd27b9013e183f9' 
  AND token = 'Y9BWoEelEZUVYyWrfrhWeA/7lkovS1GLAKGpl8crH8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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