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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2241f21f48389278973a7f322359dfa5566461ff12138d24239b8a1e4920eb' 
  AND token = 'TRMDn27VFhqGpBXNxW9Tg9kVHgjn9Z8dd6yjhEoNS/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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