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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3262fc8255e418f4444f39ba994e64d215c29aa7b5a0a25f1a5c2d006d7a29c9' 
  AND token = '8Q2nlxxqxJJjl8b4fBsKzXnHoa8eDe39+wE95sFjQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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