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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b8695ac72d86073c8a05e91d7c65db3edfffbb00d4a8e6360276b10c5d4acb' 
  AND token = 'HkLdHfnLkFP7/0zp91qhL0FDfc8bJnHKiuPVLg1EvZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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