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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37fa647861773d34ae4c6c9ebfb3f67616770a0203d51dd086e7ea96aff8c188' 
  AND token = 'InIMI1ERdLBb3cNahQur7TLH0SZYtW+WS/y+XAnZ85Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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