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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc5b71aef62e2246c80695c59cdf61c0c3497ea21dacc3cb9b5f074889df307' 
  AND token = '+rAtqepIjpgcQISIHBRBSMSZ7UgSJgRxENSDXD95eWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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