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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2e5880bad16541254f14dbf34821d9045487905a0113ce147b4add4b41a8c5' 
  AND token = '3atz/7TUT62uwegBymmO0lbxj9z+w40lpf+lzcLa9Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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