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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f02302cd6f11d3695e1d78e9a3f60352de20f16e2bb32b8d048c6a2ddbc3914' 
  AND token = '96iDIDsENR7nk8+T+KgLuYccvJRC1TRID7j38en7MbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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