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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafdea402ee3725b9a14a49964ecd49529f3d89e146a8cca70cba08b2e427070' 
  AND token = 'qtzu2ViIVLGgfCwH4+G+BHQqW1J4B7a8UZyE+/MesIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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