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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d76e76df12d028c80bf3f96ac8f68d694ef73f5816aa9d742948563a695cb4' 
  AND token = '8O942NzQdECQLXdvPHR45s/niZRO9a/wxBDXIbfhqLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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