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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1af0559c9d293964deb04ccac93946edbede09e9e640f4aa4f618b7d7e6d5b' 
  AND token = '4Xa0QWVz+5J2w4Im7GWlzvEu4BvWS2YVxoixUx/LUPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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