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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c891600479f51f6f5c0bf035042a7091f1f067c20e5ba99ebecd0aa2e5fa1b5c' 
  AND token = 'DTui7sPhP1RxadoZZQA8/LRAC/tnRcfR+e9/T2NJry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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