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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0013fadf5f296821bb220242f47f8b0618d4b3ca1dd5f1fb4a3494fd7697f18' 
  AND token = 'VfTXLeaogBmdSVxPsY2IWC6tK/7XO/Gw7sLApfGWiNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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