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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae45dfc9a9b874b02fe085b4774fadb8df90358472d925237f68298234d4a837' 
  AND token = 'M3h8iNv2yFDxhUwX9VY/pmFFY/BExNgFiE76Hb4gYSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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