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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347528f50e1a0afce7ca318f9f32cf4690ba828ffb6df6fd963bc6a3b53186ed' 
  AND token = '9PPnW92GIfjMDUKTR0TTsom+OB+bNusVpr12Fnd1Bfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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