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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669053b48d2305d28fd4952bbe2d47a68ebe6bd30b37e735bf5e8dd32b7e23f7' 
  AND token = 'RqWUoYsr0cGCOEy1Dz37YxgyLNTaYHuU8SnsJGOLLN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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