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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72832cfd21f7014d427e1a0393319eb3a7bbeda9969a01f4f4c1d5b18b78f505' 
  AND token = 't81x0PqzWd5xKvcSBAKMQMjg4dxQWVnq/vmTCbe2E34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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