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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d13b2aeb79d7aae2d51e828d91dfbe38e040f7135cc66133d0c84ec32c4df70' 
  AND token = 'az+RuH9gbt+PjHeS2tW4A1kRodNrqMV5hYH0RmgbnTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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