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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2079d4c166184b60356a97c899ae6e3c0e4a6e9e0e06b90dfa0b64ff97e589' 
  AND token = 'ZRjMMHGBlYxUTa6eTJkbupkLi6SLd43JzKukdO+83Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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