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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4581d301e7be13422aceb97dd9d28bf32eccf8730965339ccb066165d081c3a7' 
  AND token = 'yRokxDz/myx6I/b28e4TNeTcy95NHx0NjJhvgRuKhk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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