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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2c5f9d563f26254210222651bf60eef284b32cce72241483f8665c31bfc39f' 
  AND token = 'OvQH5JVS4vvMBi715sHnwCoyT+LM245T2leXuyHUCQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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