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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3f4dc31872d2f04a3dfe290e0cceb2bffb22413bba0c67f56a7527f92baf33' 
  AND token = 'MvVH2nnpktqn1xzHSFw7s6CVR5uM1MKmyvxu483LwxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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