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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3d91bb47bdc3633052ca3d8abefd0e20d8841627b523d2ae3ff6e8bdd3791c' 
  AND token = 'C1KL5Wcibk6ZZcjmOQnAulXe/t8qE1j0P731/TZ7cfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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