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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73710f471f95ae5101a48b905b14356c068517210ad5b0fae18d032b6a6d000c' 
  AND token = 'hfyEAdq6MdvDGN+xy/KNSWuYkLpm9UWGs/Pf8BJRCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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