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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3d84c7cba10a061448bcdc427230129154c981090d14f020c05ce4c620753f' 
  AND token = 'w/CG59qlFcNkUk7Hxsa6shXSHiwQa5Xwb5mYabswqwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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