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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799fe28fbb617a1b90da96dd9ed7f2451d89b8d0963ce695d65f89f0728cf03c' 
  AND token = 'OeOGCS0YOPpGRbb5BLAmoLHbOsUfjV4k3ABj9DUbtl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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