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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920146eb405d90d7ceeb1091ac1574e6c7875800973fa1f542247a9ba02a5e98' 
  AND token = 'bZsIiRdc2f9FGc36oP7qHntXFkdqcuEiACJi51RVV6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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