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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d56406204facaa2a8c659bae6375bfdb458885086760ad347a0f56f7fe6948' 
  AND token = '+pCiB9PiQwMr5AJUe+mm/rvQA0W92SOqk1BphWj4+9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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