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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80dd5157fd4ed16e34860a7749e5435d7684158b6ca7e1206a0e958d4483956' 
  AND token = 'T//VdWU1JdyIl8o3bYpdhDeTE7eJxkQNu11uWEQFcPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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