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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02f822f0fe4c82d5467e2e1bef63ce13107fe5e31ae9bcdf78c6f132889eb93' 
  AND token = 'EJm2XOlz10Fvr8TgCDX/I/O67eLYwjKHiyV8Q+2opVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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