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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7953b023522b39458fa4cb30d8db23f649423e8e2efd0f70c7455598202d6e2' 
  AND token = 'AIfHKUTX0BXu/IiTEJlTTLOrTjBS14YJofBCYyTLb2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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