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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0175f7310d7d4ad8dec028bd2aad6eddb927f7e7e89a0c65d507dfbf7c3c763c' 
  AND token = '37Zj+W5YUZus2Zj5bJRWwbHeBh8JD6ZgkJbAXIzPX5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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