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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b20b32904dc39c00b46f62acc2f7aca76692e2e9fca9e501d7250253d58b5e' 
  AND token = 'PPjsSP69GOjvGzKPA+yt7nlEghPUUCJcxYonMQatU7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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