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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5526865f27dd77a797505a99a5dfc186a4be138c1e8f0e1e73a13dc265e2501d' 
  AND token = 'CgSQb6TtTjQ8ab08Locdj9n7+AjuqJt0YMgG2g6fnJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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