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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5882cb2797052d82d6768005fc9f37aa6f8fe982d306da847fa3050047e40da9' 
  AND token = 'SFKvXnqAA2Irb1tcDeK8B7geHiS4dBs0Got3eE0l97M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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