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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c6d71c46fe042bddfa0dc85813af4075d16f712f2bd66d6636e52941166471' 
  AND token = '3YAVJbTipALLchkuzawjWPRhPRS4UDIxR2AYSYYCl/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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