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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdd23afe7181c4d077ab03ab44f28906af3175c5784fd4a4a40c08122492cf2' 
  AND token = '5vHQMFzEwAyn+20o8RsJTXacjW1TBrF99mVV3ugPiEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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