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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f7d75d3af7dac285cd1a21c4a52632ebc97739ac02a55209b97c9ced7010b4' 
  AND token = 'lbkaiXoxE3mBXApiinOlV/a+wqYdE341Gi/GoAlBybM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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